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TM 5-4320-306-24
4-8. REPLACE/REPAIR CAMSHAFT (Continued)
15
Under normal conditions, the radial clearance (difference between above measurements) should be 0.0028 to
0.0047 inch (0.07 to 0.12 mm). If clearance is greater than 0.0079 inch (0.200 mm), the camshaft (1) and/or
crankcase (12) must be replaced. If camshaft rear journal (7) diameter is within its specified limits, replace the
crankcase in accordance with paragraph 4-13. If camshaft rear journal is worn and outside its specified limits,
replace the camshaft. Measure bore, journal, and radial clearance again to check that the clearance is within
specified limits Install new dished plug (11) with camshaft plug installer No. 143610.
16
Measure height of cam lobe (14) from shaft to top of lobe. Height should be 0.3110 to 0.3189 inch (7.90 to 8.10
mm). If cam lobes are damaged or worn, and do not measure within the specified limits, replace camshaft (1).
Minor nicks, burrs, or wear may be smoothed out with a surfacing stone or crocus cloth. Reclean camshaft as
described in steps 1 and 2.
4-61
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